Dear Champs,
I am asking this for our customer.
For LDO design,
In F2837x datasheet, it says in 8.9.1.3 VDD Requirements,
"During the ramp, VDD should be kept no more than 0.3 V above VDDIO"
On F28379D control card, we use TPS62420DRC from 5VDC to 3.3VDC for VDDIO and 1.2VDC for VDD together.
The user asks what if they user 5V -> 3.3V -> 1.2V?
In this case, 1.2V ramping is always later than 3.3V, which still does not violate "During the ramp, VDD should be kept no more than 0.3 V above VDDIO".
Therefore, "5V -> 3.3V -> 1.2V" can be used.
Is our understanding correct?
Wayne
Wayne Huang
